- Allow transparent backgrounds.
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德索托的理论依然重要，因为它提醒我们，资本不是凭空产生的，而是制度信任的结果。产权是市场经济的基础，没有产权就没有资本形成，也没有长期投资。他的实践也曾奏效，1990年代的改革曾让秘鲁从崩溃边缘走向增长轨道。问题在于，产权需要制度来保护，而制度建设远比产权登记困难。
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Instead of perturbing each pixel in the input image at random, we can choose to dither by a predetermined amount depending on the pixel’s position in the image. This can be achieved using a threshold map; a small, fixed-size matrix where each entry tells us the amount by which to perturb the input value , producing the dithered value . This matrix is tiled across the input image and sampled for every pixel during the dithering process. The following describes a dithering function for a 4×4 matrix given the pixel raster coordinates :